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Doppler physics

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https://www.readbyqxmd.com/read/28211726/realization-of-translational-symmetry-in-trapped-cold-ion-rings
#1
Hao-Kun Li, Erik Urban, Crystal Noel, Alexander Chuang, Yang Xia, Anthony Ransford, Boerge Hemmerling, Yuan Wang, Tongcang Li, Hartmut Häffner, Xiang Zhang
We crystallize up to 15 ^{40}Ca^{+} ions in a ring with a microfabricated silicon surface Paul trap. Delocalization of the Doppler laser-cooled ions shows that the translational symmetry of the ion ring is preserved at millikelvin temperatures. By characterizing the collective motion of the ion crystals, we identify homogeneous electric fields as the dominant symmetry-breaking mechanism at this energy scale. With increasing ion numbers, such detrimental effects are reduced. We predict that, with only a ten-ion ring, uncompensated homogeneous fields will not break the translational symmetry of the rotational ground state...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28211004/point-of-care-ultrasound-and-doppler-ultrasound-evaluation-of-vascular-injuries-in-penetrating-and-blunt-trauma
#2
REVIEW
Miguel Angel Montorfano, Fernando Pla, Leonardo Vera, Omar Cardillo, Stefano Geniere Nigra, Lisandro Miguel Montorfano
BACKGROUND: The aim of this study is to describe point-of-care ultrasound and Color flow Duplex Doppler characteristics of penetrating and blunt trauma-related vascular injuries of the limbs and neck. METHODS: Penetrating and blunt trauma-related vascular injuries such as vein disruption, intimal flap, deep vein thrombosis, arterial dissection, pseudoaneurysm, and arteriovenous fistulae are discussed in this manuscript. Images of the most significant lesions of our personal clinical experience are presented to illustrate point-of-care ultrasound and Color flow Duplex Doppler ultrasound findings...
December 2017: Critical Ultrasound Journal
https://www.readbyqxmd.com/read/28158119/development-of-a-compact-optical-absolute-frequency-reference-for-space-with-10-sup-15-sup-instability
#3
Thilo Schuldt, Klaus Döringshoff, Evgeny V Kovalchuk, Anja Keetman, Julia Pahl, Achim Peters, Claus Braxmaier
We report on a compact and ruggedized setup for laser frequency stabilization employing Doppler-free spectroscopy of molecular iodine near 532 nm. Using a 30 cm long iodine cell in a triple-pass configuration in combination with noise-canceling detection and residual amplitude modulation control, a frequency instability of 6×10<sup>-15</sup> at 1 s integration time and a Flicker noise floor below 3×10<sup>-15</sup> for integration times between 100 and 1000 s was found. A specific assembly-integration technology was applied for the realization of the spectroscopy setup, ensuring high beam pointing stability and high thermal and mechanical rigidity...
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28155328/advanced-laser-based-techniques-for-gas-phase-diagnostics-in-combustion-and-aerospace-engineering
#4
Andreas Ehn, Jiajian Zhu, Xuesong Li, Johannes Kiefer
Gaining information of species, temperature, and velocity distributions in turbulent combustion and high-speed reactive flows is challenging, particularly for conducting measurements without influencing the experimental object itself. The use of optical and spectroscopic techniques, and in particular laser-based diagnostics, has shown outstanding abilities for performing non-intrusive in situ diagnostics. The development of instrumentation, such as robust lasers with high pulse energy, ultra-short pulse duration, and high repetition rate along with digitized cameras exhibiting high sensitivity, large dynamic range, and frame rates on the order of MHz, has opened up for temporally and spatially resolved volumetric measurements of extreme dynamics and complexities...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28142366/benign-peripheral-nerve-sheath-tumor-in-a-distance-runner
#5
Laura E Stanley, David J Berkoff
A 31-year-old female runner presented to physical therapy via direct access with an 8-month history of atraumatic left lateral calf pain. Following 1 month of physical therapy, the patient was referred to an orthopaedic sports medicine physician. Ultrasound imaging revealed a 2-cm hypoechoic mass with well-defined margins in the left proximal lateral soleus, while Doppler ultrasound demonstrated increased color flow surrounding the mass. Magnetic resonance imaging findings were consistent with a nerve sheath tumor, and ultrasound-guided tissue biopsy determined the mass to be a benign peripheral nerve sheath tumor...
February 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/28132404/right-ventricular-function-during-acute-exacerbation-of-severe-equine-asthma
#6
A Decloedt, H Borowicz, M Slowikowska, K Chiers, G van Loon, A Niedzwiedz
BACKGROUND: Pulmonary hypertension has been described in horses with severe equine asthma but its effect on the right ventricle has not been fully elucidated. OBJECTIVES: To evaluate right ventricular structure and function after a one-week period of pulmonary hypertension secondary to acute exacerbation of severe equine asthma. STUDY DESIGN: Prospective study. METHODS: A clinical episode of severe equine asthma was induced experimentally in six susceptible horses...
January 28, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28130851/doppler-vocal-fremitus
#7
Wesley Fiser, Balakrishna Pai, Srikanth Vallurupalli
A young woman with metastatic breast cancer was found to have a regular spectral Doppler event spanning multiple cardiac cycles and timing to her tachypneic respiratory rate, which suggested an extracardiac source. A chest CT confirmed a large mediastinal mass causing a postobstructive pneumonia. This Doppler signal reflected increased turbulence across the obstructed bronchus due to sound wave conduction through a pulmonary consolidation-a Doppler equivalent of "vocal fremitus" elicited by physical examination of a patient with a lung mass or pneumonia...
January 28, 2017: Echocardiography
https://www.readbyqxmd.com/read/28130574/randomized-comparison-of-power-doppler-ultrasonography-guided-core-needle-biopsy-with-open-surgical-biopsy-for-the-characterization-of-lymphadenopathies-in-patients-with-suspected-lymphoma
#8
Novella Pugliese, M Di Perna, I Cozzolino, G Ciancia, G Pettinato, P Zeppa, V Varone, S Masone, C Cerchione, R Della Pepa, L Simeone, C Giordano, V Martinelli, C Salvatore, F Pane, M Picardi
The sensitivity of lymph node core-needle biopsy under imaging guidance requires validation. We employed power Doppler ultrasonography (PDUS) to select the lymph node most suspected of malignancy and to histologically characterize it through the use of large cutting needle. Institutional review board approval and informed consent were obtained for this randomized clinical trial. In a single center between 1 January 2009 and 31 December 2015, patients with lymph node enlargement suspected for lymphoma were randomly assigned (1:1) to biopsy with either standard surgery or PDUS-guided 16-gauge modified Menghini needle...
January 27, 2017: Annals of Hematology
https://www.readbyqxmd.com/read/28130566/-stress-echocardiography-and-its-central-role-in-cardiac-diagnostics
#9
R Leischik, B Dworrak, T Cremer, S Amirie, H Littwitz
Stress echocardiography (SE) has an established central role as a diagnostic tool in cardiology. It is not only an established method for the diagnostic and prognostic stratification of patients with coronary artery disease but also shows an emerging value for assessment of cardiac function beyond coronary artery disease. The enormous conceptual technological development of ultrasound technology (Doppler, digitizing, tissue Doppler imaging, strain technology, 3‑D-echo and new ultrasound contrast agents) has led to applications of SE in almost all diagnostic fields of cardiology...
January 27, 2017: Herz
https://www.readbyqxmd.com/read/28128085/antiphospholipid-syndrome-with-anti%C3%AE-2glicoprotein-1-antibodies-as-the-cause-of-recurrent-tibial-vein-thrombosis-in-sapho-syndrome
#10
Hanna Przepiera-Będzak, Marek Brzosko
The antiphospholipid antibody syndrome is defined by the presence of antiphospholipid antibodies in patients with recurrent venous or arterial thromboembolism (1). SAPHO syndrome is a rare disease, characterized by specific clinical manifestations of synovitis, acne pustulosis, hyperostosis, and osteitis. It is a disease that manifests with a combination of osseous and articular manifestations associated with skin lesions (2). Venous thrombosis complicating SAPHO syndrome seems to be uncommon with an unclear pathogenesis (3-9)...
December 2016: Acta Dermatovenerologica Croatica: ADC
https://www.readbyqxmd.com/read/28119443/measuring-physical-stigmata-of-niacin-associated-skin-toxicity-by-colorimetry-white-light-spectroscopy-laser-doppler-flowmetry-and-thermometry-in-combination-with-symptom-perception-scoring-methods-to-aid-development-of-niacin-mimetics
#11
Richard L Dunbar, Harsh Goel, Sony Tuteja, Wen-Liang Song, Grace Nathanson, Zeeshan Babar, Dusanka Lalic, Joel M Gelfand, Daniel J Rader, Gary L Grove
Though cardioprotective, niacin monotherapy is limited by unpleasant cutaneous symptoms mimicking dermatitis: Niacin-Associated Skin Toxicity (NASTy). Niacin is prototypical of several emerging drugs suffering off-target rubefacient properties, whereby agonizing the GPR109A receptor on cutaneous immune cells provokes vasodilation, prompting skin plethora and rubor, as well as dolor, tumor, and calor, and systemically, heat loss, frigor, chills, and rigors. Typically, NASTy effects are described by subjective, patient-reported perception, at best semi-quantitative and bias-prone...
January 23, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28095492/growth-hormone-deficiency-is-associated-with-worse-cardiac-function-physical-performance-and-outcome-in-chronic-heart-failure-insights-from-the-t-o-s-ca-ghd-study
#12
Michele Arcopinto, Andrea Salzano, Francesco Giallauria, Eduardo Bossone, Jörgen Isgaard, Alberto M Marra, Emanuele Bobbio, Olga Vriz, David N Åberg, Daniele Masarone, Amato De Paulis, Lavinia Saldamarco, Carlo Vigorito, Pietro Formisano, Massimo Niola, Francesco Perticone, Domenico Bonaduce, Luigi Saccà, Annamaria Colao, Antonio Cittadini
BACKGROUND: Although mounting evidence supports the concept that growth hormone (GH) deficiency (GHD) affects cardiovascular function, no study has systematically investigated its prevalence and role in a large cohort of chronic heart failure (CHF) patients. Aim of this study is to assess the prevalence of GHD in mild-to-moderate CHF and to explore clinical and functional correlates of GHD. METHODS: One-hundred thirty CHF patients underwent GH provocative test with GHRH+arginine and accordingly categorized into GH-deficiency (GHD, n = 88, age = 61...
2017: PloS One
https://www.readbyqxmd.com/read/28086960/the-relationship-between-synovitis-quantified-by-an-ultrasound-7-joint-inflammation-score-and-physical-disability-in-rheumatoid-arthritis-a-cohort-study
#13
Jakub Závada, Petra Hánová, Jana Hurňáková, Lenka Szczuková, Michal Uher, Šárka Forejtová, Martin Klein, Herman Mann, Marta Olejárová, Olga Růžičková, Olga Šléglová, Karel Hejduk, Karel Pavelka
BACKGROUND: Restoring normal physical functioning is a major therapeutic aim in the management of rheumatoid arthritis (RA). It is unknown, whether the extent of synovial inflammation quantified by musculoskeletal ultrasound (US) can predict current or future capacity for physical functioning. To answer this question we investigated the longitudinal relationship between physical function assessed by the health assessment questionnaire (HAQ) and the German 7-joint ultrasound score (US7S) in a prospective cohort of patients with RA...
January 13, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28086907/identification-of-the-main-determinants-of-abdominal-aorta-size-a-screening-by-pocket-size-imaging-device
#14
Roberta Esposito, Federica Ilardi, Vincenzo Schiano Lomoriello, Regina Sorrentino, Vincenzo Sellitto, Giuseppe Giugliano, Giovanni Esposito, Bruno Trimarco, Maurizio Galderisi
BACKGROUND: Ultrasound exam as a screening test for abdominal aorta (AA) can visualize the aorta in 99% of patients and has a sensitivity and specificity approaching 100% in screening settings for aortic aneurysm. Pocket Size Imaging Device (PSID) has a potential value as a screening tool, because of its possible use in several clinical settings. Our aim was to assess the impact of demographics and cardiovascular (CV) risk factors on AA size by using PSID in an outpatient screening. METHODS: Consecutive patients, referring for a CV assessment in a 6 months period, were screened...
January 13, 2017: Cardiovascular Ultrasound
https://www.readbyqxmd.com/read/28076590/effect-of-maternal-exercises-on-biophysical-fetal-and-maternal-parameters-a-transversal-study
#15
Caroline Mombaque Dos Santos, Wendel Mombaque Dos Santos, Francisco Maximiliano Pancich Gallarreta, Camila Pigatto, Luiz Osório Cruz Portela, Edson Nunes de Morais
Objective: To evaluate the acute effects of maternal and fetal hemodynamic responses in pregnant women submitted to fetal Doppler and an aerobic physical exercise test according to the degree of effort during the activity and the impact on the well-being. Methods: Transversal study with low risk pregnant women, obtained by convenience sample with gestational age between 26 to 34 weeks. The participants carry out a progressive exercise test. Results: After the exercise session, reduced resistance (p=0...
October 2016: Einstein
https://www.readbyqxmd.com/read/28074044/diabetic-myonecrosis-a-rare-complication-of-diabetes-mellitus-mimicking-deep-vein-thrombosis
#16
Himanshu K Khanna, Andrew C Stevens
BACKGROUND Diabetic myonecrosis is an uncommon complication of long-standing poorly controlled diabetes mellitus. It presents as acute non-traumatic swelling and pain of the lower extremity, which can mimic deep vein thrombosis (DVT). The clinical course is usually self-limiting and patients respond well to supportive medical therapy. CASE REPORT A 54-year-old male with past medical history of poorly controlled diabetes mellitus type II, hyperlipidemia, gastroesophageal reflux disease (GERD), and remote history of DVT presented to our emergency department with 2-week history of progressively worsening left calf pain and swelling...
January 11, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28050946/diagnosing-carpal-tunnel-syndrome-with-doppler-ultrasonography-a-comparison-of-ultrasonographic-measurements-and-electrophysiological-severity
#17
Nihal Kutlar, Ayse Oytun Bayrak, İlkay Koray Bayrak, Sevgi Canbaz, Hande Türker
INTRODUCTION: Carpal tunnel syndrome (CTS) is the most common entrapment neuropathy. Diagnosis is based on clinical history, physical examination, and electrophysiological studies. Imaging techniques are performed for difficult-to-diagnose cases because they provide information about the morphology of the median nerve. More recently, it has been shown that Doppler ultrasonography can detect increased intraneural blood flow in CTS. The aim of our study is to evaluate the relationship between the severity of CTS, hypervascularization, and cross-sectional area (CSA) to determine the diagnostic value of Doppler ultrasonography...
February 2017: Neurological Research
https://www.readbyqxmd.com/read/28042750/pseudo-aneurysm-a-rare-complication-of-ankle-arthroscopy
#18
Mathew Davis, David Brooks, William Bryceson
A 53-year-old woman underwent arthroscopic ankle debridement for posttraumatic arthrofibrosis 2 years following a bimalleolar ankle fracture. Twelve months postarthroscopy, the patient returned to physical therapy with a 2-week history of pain and prominent swelling to her anterior ankle. Urgent follow-up was arranged with an orthopaedic surgeon, who ordered a radiograph and magnetic resonance imaging, which demonstrated a large heterogeneous mass. Doppler ultrasound was also ordered and confirmed the mass to be a pseudo-aneurysm of the anterior tibial artery...
January 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/28018723/spectrometer-calibration-for-spectroscopic-fourier-domain-optical-coherence-tomography
#19
Maciej Szkulmowski, Szymon Tamborski, Maciej Wojtkowski
We propose a simple and robust procedure for Fourier domain optical coherence tomography (FdOCT) that allows to linearize the detected FdOCT spectra to wavenumber domain and, at the same time, to determine the wavelength of light for each point of detected spectrum. We show that in this approach it is possible to use any measurable physical quantity that has linear dependency on wavenumber and can be extracted from spectral fringes. The actual values of the measured quantity have no importance for the algorithm and do not need to be known at any stage of the procedure...
December 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/28003725/neonatal-cholestasis-as-initial-presentation-of-portosystemic-shunt-a-case-report
#20
Güzide Doğan, Fatih Düzgün, Serdar Tarhan, Yeliz Çağan Appak, Erhun Kasırga
Congenital intrahepatic portosystemic shunts are rare in children. Portosystemic venous malformations are characterized by extreme clinical variability. We report a full-term 33-day-old male infant presenting with neonatal jaundice. On physical examination, he had generalized icterus and the liver was palpable 3.5 cm below the right costal margin. He had no other symptoms. Laboratory tests showed AST 632 U/L, ALT 198 U/L, total bilirubin 12.1 mg/dL, conjugated bilirubin 10.2 mg/dL, alkaline phosphatase 753 U/L, GGT 47 U/L and glucose 67 U/L...
December 2016: Journal of Clinical and Experimental Hepatology
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